208406938867 has 2 divisors, whose sum is σ = 208406938868. Its totient is φ = 208406938866.

The previous prime is 208406938847. The next prime is 208406938889. The reversal of 208406938867 is 768839604802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208406938867 - 2⁷ = 208406938739 is a prime.

It is a super-3 number, since 3×208406938867³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (208406938847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104203469433 + 104203469434.

It is an arithmetic number, because the mean of its divisors is an integer number (104203469434).

Almost surely, 2^208406938867 is an apocalyptic number.

208406938867 is a deficient number, since it is larger than the sum of its proper divisors (1).

208406938867 is an equidigital number, since it uses as much as digits as its factorization.

208406938867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 208406938867 in words is "two hundred eight billion, four hundred six million, nine hundred thirty-eight thousand, eight hundred sixty-seven".